Search results
depth carbonation of concrete samples with dierent water to cement ratios under dierent time were tested by the ve methods. A comparison on the determination procedures and data from the...
1 cze 2024 · To study the quantitative relationship between pore structure and macroscopic mechanics of aeolian sand concrete(ASC) under carbonation-dry-wet cycle(DWCs), the fractal characteristics of ASC under carbonation DWCs were analyzed by means of nuclear magnetic resonance(NMR) technology.
11 mar 1990 · Abstract. The use of nuclear magnetic resonance (NMR) in cement and concrete research has been reviewed and the potential of the technique for future research has been elucidated. The most important nuclei Jor cement and concrete research are 1 H, 13 C, 27 Al and 29 Si, and representative examples are given for each of them.
14 maj 2020 · The microstructure parameters such as porosity and pore size distribution of the test concrete were tested by NMR. Secondly, based on the test results, the influences of w/b ratio and admixtures on water and gas permeability of concrete were explored.
26 mar 2024 · Wu et al. developed a prediction model using the RF algorithm, established training and testing sets based on raw data, and successfully predicted concrete carbonation depth. Similarly, Londhe et al. [ 87 ] employed Model Tree, RF, and MGGP methods to predict the carbonation coefficient of concrete.
14 cze 2024 · The quasi-stationary flow method was used to test the gas permeability of concrete. Finally, a random hierarchical bundle model using the NMR-MIP method is proposed to predict the gas permeability of cementitious materials based on their pore size distribution.
18 paź 2021 · The carbonation behavior of stress-damaged concrete in mesoscale was analyzed. A modified carbonation model centered on humidity-temperature-CO 2 coupling was proposed. Its parameters were determined based on a 3-year natural carbonation test. The model was then verified by comparing carbonation results with that of accelerated experiment (2% ...
